I think I've said this here or elsewhere, but the worst thing for Moonlight is having big expectations. It's a small film, not a big movie. And yes, it is a much slower pace than most modern movies. On the one hand, I never would have seen it but for the hype; on the other hand, I didn't think it lived up to the hype. But I am glad I saw it. It is a provocative movie that stays with you if you stay with it, but it doesn't hit you over the head with anything. There are some very good individual performances that I think are Oscar-worthy, but I'm not sure I agree that the movie itself is worthy of best picture, either.
As for "the point," again I think I have said this when comparing it and Manchester By The Sea, but I think the point was to depict the humanity of living a tortured existence, and what people do to cope and try to overcome it in less-than-ideal circumstances, to put it mildly.